Check if the referenced file is loadable, and if not, don't update.

sc/inc/externalrefmgr.hxx

@@ -672,6 +672,12 @@ public:
      */
     void notifyAllLinkListeners(sal_uInt16 nFileId, LinkUpdateType eType);
 
+    /**
+     * Check if the file specified by the path is a legitimate file that
+     * exists & can be loaded.
+     */
+    bool isFileLoadable(const String& rFile) const;
+
 private:
     ScExternalRefManager();
     ScExternalRefManager(const ScExternalRefManager&);
@@ -722,7 +728,6 @@ private:
     const ScDocument* getInMemorySrcDocument(sal_uInt16 nFileId);
     const ScDocument* getSrcDocument(sal_uInt16 nFileId);
     SfxObjectShellRef loadSrcDocument(sal_uInt16 nFileId, String& rFilter);
-    bool isFileLoadable(const String& rFile) const;
 
     void maybeLinkExternalFile(sal_uInt16 nFileId);
 

sc/source/ui/docshell/externalrefmgr.cxx

@@ -1272,6 +1272,10 @@ void ScExternalRefLink::DataChanged(const String& /*rMimeType*/, const Any& /*rV
     String aFile, aFilter;
     mpDoc->GetLinkManager()->GetDisplayNames(this, NULL, &aFile, NULL, &aFilter);
     ScExternalRefManager* pMgr = mpDoc->GetExternalRefManager();
+
+    if (!pMgr->isFileLoadable(aFile))
+        return;
+
     const String* pCurFile = pMgr->getExternalFileName(mnFileId);
     if (!pCurFile)
         return;